Petruccelli, David (2016). "Banknotes from the Underground: Counterfeiting and the International Order in Interwar Europe". Journal of Contemporary History. 51 (3): 507–530. doi:10.1177/0022009415577003. S2CID156881357.
"§ 146 StGB - Einzelnorm" [German Criminal Code, Paragraph 146]. www.gesetze-im-internet.de. Archived from the original on 2020-05-23. Retrieved 2020-06-03.
'They are Exactly as Bank Notes are': Perceptions and Technologies of Bank Note Forgery During the Bank Restriction Period, 1797 - 1821, Jack Mockford, University of Hertfordshire, 2014, https://uhra.herts.ac.uk/handle/2299/15308#Archived 2019-12-24 at the Wayback Machine
Petruccelli, David (2016). "Banknotes from the Underground: Counterfeiting and the International Order in Interwar Europe". Journal of Contemporary History. 51 (3): 507–530. doi:10.1177/0022009415577003. S2CID156881357.
"§ 146 StGB - Einzelnorm" [German Criminal Code, Paragraph 146]. www.gesetze-im-internet.de. Archived from the original on 2020-05-23. Retrieved 2020-06-03.
'They are Exactly as Bank Notes are': Perceptions and Technologies of Bank Note Forgery During the Bank Restriction Period, 1797 - 1821, Jack Mockford, University of Hertfordshire, 2014, https://uhra.herts.ac.uk/handle/2299/15308#Archived 2019-12-24 at the Wayback Machine